Tool-grinding machine



Nov. 1, 1927.

Y. L. SMITH TOOL GRINDING MACHINE Filed May 26. 1926 3 Sheets-She et 1 Inventor Einvfl. Suzi/A Attorney Nov. 1, 1927.

1,647,203 Y. L. SMITH TOOL GRINDING MACHINE 3 'Sheets-Sheet2 Filed May26. 1926 Inventor IQuWg'Z. $7111 11! Attorney Nov. 1, 1927. 1,647,203

Y. L. SMITH TOOL GRINDING MACHINE Filed May 26. 1926 3 Sheets-Sheet 3Inventor Eur/ l; 5771 if]:

' Attorney Patented Nov. 1, 1927.

YOUNG L. SMITH, 0F KUTTAWA, KENTUCKY.

TOOL-GRINDING- -MACHINE.

Application filed May 26,

The present invention relates to improvements in grinding machines andhas for lts principal object to provide a machine which will efficientlysharpen the cutting edges of various tools such as the bit of a planeand thelike.

One of the important objects of the present invention is to provide agrinding machine which includes a reciprocating sharpener supportingcarriage, the tool to be sharpened to be mounted above said carriage,additional means being provided for holding the cutting edge of the toolin engagement with the surface of the sharpener.

A'further object of the invention is to provide a grinding machine ofthe above mentioned character wherein means is provided for supportingthe tool in various positions with regard to the sharpening element. 1 r

A further object is'to provide a grinding machine of the above mentionedcharacter which is simple in construction, inexpensive, strong anddurable and further well adapted to the purpose for which it isdesigned.

Other objects and advantages of the invent-ion will become apparentduring the course of the following description taken in connection withthe accompanying drawings.

In the accompanying drawings forming a part of this application and inwhich like numerals designate like parts throughout the several views:

Figure 1 is a side elevation of the grinding machine embodying myinvention.

Figure 2 is a vertical sectional view taken approximately on line 22 ofFigure 1 showing the construction of the crank 1n elevation.

Figure 3 is a detail perspective view of the sharpening stone supportingcarriage, the stone being shown along with the carriage.

Figure 4: is a fragmentary perspective view of the frame or bed showingthe construction of the vertically adjustable bracket provided forsupporting the tool to be sharpened at right angles to the grindingstone, the bracket for supporting the lubricating means being alsodisclosed, as well as the supporting means for stones which are to bepolished.

Figure 5 is a detail perspective view of the bit clamp.

19%. Serial Nb. 111,746.

Figure 6 is a similar view of the bit supporting plate and the pivot rodassociated therewith, I

Figure 7 is a fragmentary top plan view showing the angularly disposedbracket for supporting the tool at an oblique angle with respect to thegrinding stone, and

Figure 8 is a detail view of the oil can associated with the grindingmachine.

In the drawings wherein for the purpose of illustration is shown thepreferred embodiment of my invention, the numeral 1 designates generallythe frameor bed of the grinding machine, the same including the base 2on which is secured the spaced sides 3 and 4 respectively, a spacingblock 5 being interposed between the sides and also secured on the base2 in the manner as clearly shown in Figure 4. The inner opposed upperedges of the sides 3 and a are cut away longitudinally to provide thetracks 6 and 7 respectively, and the purpose thereof will be hereinaftermore fully described.

The grinding element in the present invention comprises a sharpeningstone 8 of any well known type now on the market, the same beingpreferably rectangular in design. This sharpening stone is adapted to beremovably supported on the carriage 9 provided therefor and theconstruction of which will now be specifically described. This carriage9 comprises the sidemembers 10 and 11 which are arranged in parallelspaced relation through the medium of the cross members 12 and 13. Theinner opposed upper edge portions of the side members 10 and 11 are cutaway longitudinally as illustrated at 14 on which said cut away portionis adapted to rest the bottom of the side edge portions of thesharpening stone 8 as is readily obvious from the construction shownmore clearly in Figure 3.

It of course is understood that these sharpening stones are of the samewidth but vary frequently in length and for the purpose of accommodatingsharpening stones of various lengths, I provide a pair of complementaryclamps shown at 15, the same being slidable on the upper edges of theside members 10 and 11 and the outer ends of these clamp membersterminate ininwardly extending hooks or jaws 16 which engage one end ofthe sharpening stone. An additional cross member 17 is adapted forslidable movement between the side members 10 and 11 and associated withthis cross member 17 is a spring metal clip 18 which is adapted toengage the other end of the sharpening stone, the ends of the springclips being disposed laterally for engagement with the respective sidesof the stone. This movable cross bar 17 is actuated through the mediumof a screw 19 which is secured at its forward end in any appropriatemanner to the movable cross bar 17, the same being threaded through thestationary cross bar 12 and having a suitable actuating handle 20 on itsouter end.

The outer lower edge portions of the side members 10 and 11 of thecarriage 9 are also cut away as indicated at21 in order that the sidemembers lO and 11 will be permitted to move along the tracks 6 and 7respectively formed on the inner opposed upper edge portions of thesides 3 and 4 of the bed or frame 1.

A crank shaft 22 has its ends extending through suitable journals 23provided therefor on the upper edges of the sides 3 and 4 of the bed orframe 1 adjacent one end thereof, and one end of the shaft terminates ina hanch actuating crank 24. A pitman or connecting rod 25 is secured tothe crank 22 at its outer end, the inner end of the pitman or crank rod25 being pivotally secured to the transverse pin 26 which is securedbetween the side members 10 and 11 of the carriagc 9 adjacent one endthereof. This construction provides a means whereby the carriage 9 whichcarries the sharpening stone 8 may be reciprocated on the bed orframe 1. If desired, a grooved pulley wheel 27 may be secured on thecrank shaft 22 for permitting the latter to be actuated by any suitablemotor (not shown), it being understood of course that a belt or the likeis trained over the pulley wheel for operatively connecting the samewith said motor.

A pair of brackets 28 are secured on the outer faces of the sides of thebed at the intermediate portion thereof and these brackets are adaptedfor vertical slidable movement. The lower portion of each racket isprovided with the longitudinally extending slot 29 and cooperatingtherewith is the thumb screw 30. This provides a means whereby each ofthe brackets may be adjusted in any vertical position. Furthermore thesebrackets are adapted for ver tical slidable movement through suitableguides 31 which are secured on the upper edges of the intermediateportions of the sides of the head or frame in the manner clearly shownin Figure 4. The upper end portion of each bracket is provided with apair of vertically spaced openings 32 and the purpose thereof will alsobe hereinafter more fully described. These brackets are arranged in thesame vertical plane. 7 n

An additional pair of brackets designated by the numerals 33 and 34respectively are also secured on the outer faces of the sides 3 and ,4respectively of the bed or frame 1, the brackets 33 being arrangedadjacentthe side edge of the bracket 28 which is secured on the side 3,the bracket 34 being secured on the outer face of the other side of thebed adjacent the opposite side edge of the other of the first mentionedbrackets 28, and this construction is more clearly shown in Figure 1.

Each of the last mentioned pair of brackets is twisted at itsintermediate portion so that the upper edge portions ofthe brackets 33and 34are disposed at an angle and the purpose of this arrangement willbe hereinafter more fully described. The lowerportion of each of thelast mentioned pair of brackets isalso provided with a longitudinallyextending slot such as is shown at 35 whereby these brackets may bemoved verticallyand suitable thumb screws 36 are.

provided for holding these brackets in any vertically adj ustedposition. The upper end portions of the last mentioned pair of bracketsis also provided with a pair of vertically spaced openings shown at 37similar to the openings 32 formed in the upper ends of the brackets 28.a

The tool holding means comprising a plate 38 from the sides of whichextend upwardly the ears 39 and 40 respectively. The ear 40 is longerthan the ear 39 as is clearly shown in Figure 6, and the purpose thereofwill be hereinafter more fully described. Each ear is provided withopenings 41. The plate is principally adapted to support thereon a bit42 such as is commonly used in bench planes, the cutting edge of whichis to be resharpened on the present machine. The bottom face of the bit42 is adapted to lie upon the upper face of the plate 38 so that thecutting edge of the bit will extend beyond the lower edge of the plateand for the purpose of holding the bit on the plate I provide the bitclamp 43. i v

This bit clamp is provided at its upper face with the transverselyextending parallel spaced grooves 44 as is shown more clearly in Figure5 and the purpose thereof will be presently apparent. A thumb screw 45is threaded through the upper reduced portion of the bit 43 and carrieson its lower end the bit engaging head 46. The pivot forming rod 47which extends through one pair of registering openings provided in theupstanding ears 39 and 40 has its intermediate portion seated in one ofthe transversely extending grooves 44 formed in. the upper face of thebit clamp 43 and the manner in which the bit clamp secures the bit 42 inposition on the plate 38 is clearly shown in Figure 1.

hen the bit is to be disposed transversely of the sharpening stone so asto extend at right angles thereto, the outer ends of the "ming rodliaredisposed in'one pail" ring openings formed in the upper ackets 38.-One end ofthe pivot "d 4:! is threaded as indicated at 48 1 Lr oflock-nuts such as are shown at 49 are-threaded on the threaded end 48 ofthe rod 4-7, the same being disposed on opposite sides of the bracketwhichis secured on the side 4 of the bed or frame 1; This provides ameans whereby the pivot rod 47 will be prevented from being accidentallydisplaced li'Olll the supporting bracket.

For the purpose of holding the cutting edge of the bit 42 in engagementwith the upper surface of the grinding stone 8, I pro vide thecontractile coil spring 50, tie same being secured at one end to thebook 51 pro- Vided therefor on the upper end of the elongated ar 40, theother end of the spring se cured to the upuer end of the suitable pin 52which extends upwardly from the upper edge of the side 3 in the manneras clearly shown in Figure 1.

lfhen the blade or bit is to be disposed at an oblique angle, the pivotrod a7 is removed in the pair of brackets 28 and the ends of the pivotred are then disposed through one pair of registering openings formed inthe upper ends of the brackets 33 and respectively and the lock nuts 49are thraded on the rod 48 and engage the opposite faces or sides of theupper portion of the bracket 34 as is clearly shown in Fig ure 7. inthis manner, the bit to be sharp ened may either be disposed at rightangles or at oblique angles to the sharpening stone.

For the purpose of lubricating the sharpening stone, there is providedan inverted oil can 53, the same being pivotally supported between theupper ends of a pair of vertically adjustable brackets 54, the lower endportions of the brackets being arranged on the outer faces of therespective sides of the bed or frame 1, and being provided with lonlnalslots similar to the longitudinal mc-d in the lower end portions of theheretofore described. Suitable brackets lots 56 in the lower endportions of the and into the respective sides of frame holding thebrackets in any very adjusted position. The pivotal sup port for the oilcan 53 and the upper ends of these brackets is shown at 57.

A lubricant applying cloth 58 is clamped betwen a pair of transverselyextending rods 59 which rods have their ends extending through thebrackets 54 and this cloth is adapted to engage the upper face of thesharpening stone 8. The discharge spout 60 o the oil can 53 is normallydisposed directly above the cloth 58 and the oil or other lubrica twhich is discharged from the can 53 through the spout 6 will by gravitydrop onto the cloth 58 and the latter will be saturated sufiicient topermit the upper surface of the grinding stone to be properly lubricatedA manually actuated valve designated by the numeral 61 is associatedwith the'spout of the oil can forregulatingthe flow of oil from the canonto the applying cloth.

lVith the parts arranged as shown in Figure 1 it is obvious that whenthe crank shaft 22 is operated, a reciprocatory'movemenl. will beimparted to the stone supporting carriage, thus moving the stone acrossthe cutting edge of the bit which is supported on the plate 38 and thecoil spring 50 will maintain the cutting edge of the bit in engagementwith the upper surface of the stone so that the sharpening of the bitmay be readily and easily performed. It is of course understood that thecarriage 9 is limited in its reciprocatory movement so that the cuttingedge of the bit will at all times be maintained in engagement with theupper surface of the stone.

For the purpose of polishing stones such. as are used in honing ofrazors and the like, there is provided on the upper edges of the sides3a pair of adjustable brackets 62 and 63 respectively, a similar pair ofbrackets 64 and 65 being slidably supported on the upper edge of theother side of the bed or frame 1 as is clearly shown in Figure 4. Thesebrackets are provided with the longitudinally extending slots designatedgenerally by the numeral 66 and a screw 67 extends through each slot forholding each of the brackets in the desired adjusted position. The innerend of each of the brackets is disposed upwardly to provide a jaw andthe several jaws are adapted to be secured to the ends of the woodenreceptacle usually associated with the stone to be polished so that theface of the stone to be polished will frictionally engage the uppersurface of the sharpening stone 8. It is of course understood that thebit holding means as well as the oil distributor cloth must be removedfrom above the stone 8 in order to permit the machine to be used inpolishing other stones.

It will thus be seen from the foregoing description that I have provideda grinding machine which will be very efficient in resharpening thecutting edges of bits and similar tools, the parts of my machine beingarranged in such a manner as to enable the same to be readily and easilyadjusted or removed.

Vfhile I have shown the preferred embodiment of my invention it is to beunderstood that minor changes may be made in the invention withoutdeparting from the spirit and scope of the appended claim.

Having thus described the invention, what lclaim as new and desire tosecure by Letters Patent is In a grinding machine of the class doscribed, a bed, a pair of brackets secured, on the opposite sides of thebed, a sharpening element adapted for reciprocatory movement on the bed,a tool holder comprising a plate on which the tool rests, upstandingears formed on the respective sides of said plate, a pivot forming rodextending transversely through the ears and said brackets, a clamp forsecuring the tool on the plate, said clamp having a series of spacedtransversely extending grooves formed in the upper face of the lower endportion thereof, the intermediate portion of the pivot rod fitting inone of said grooves, a thumb screw threaded through the upper portion ofsaid clamp, a 15 tool engaging head carried by the lower end of thescrew, and means for maintaining the cutting edge of the tool inengagement with the upper surface of the sharpening element,

In testimony whereof I aflix my signature.

YOUNG L. SMITH.

